recall that 744 = 360 + 360 + 24, whilst -336 - 24 = -360.
check the picture below.
to start, let's get rid of the 3/4 by multiplying everything by 4/3 and getting 4/3. now, we have 4z/3 = mn, and we can just divide both sides by m to get (4z)/(3m).
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